SUPERNATURAL’S 100TH EPISODE STUNS WITH AN OLD FRIEND AND A SACRIFICE — Dean (Jensen Ackles) begins to think the only way to stop Lucifer is to say yes to Michael, but the angels decide they don’t need him anymore. Dean, Sam (Jared Padalecki) and Castiel (Misha Collins) are horrified at the angels’ new game plan and take on Zachariah (guest star Kurt Fuller) to prevent an all out war on Earth. Meanwhile, a familiar face returns. Phil Sgrricia directed the episode written by Jeremy Carver (#518).